basic functions of ultrasonic piezo measurement

The two-phase of driving signal phase piezoelectric ring actuator is continuously adjustable; the two driving signals can be adjusted in reverse to change the steering direction.

The frequency can be adjusted within 20kFlz----100kFtz; because the ultrasonic motor is a capacitive load, it is necessary to achieve impedance matching. With test and actual operation switching function; with the working status setting of  piezoelectric ring transducer, it is control mode setting, parameter display, waveform tracking. This paper combines PID control and fuzzy control based on the combination of existing ultrasonic motor voltage regulation, frequency modulation and phase modulation control methods. Due to the existence of a certain steady-state error in the fuzzy control system, there is a control blind zone: the PID control is not adaptable to the change of the control object. Therefore, this design adopts a multi-mode control strategy based on a digital signal processor (DSP) in a large deviation range. The piezoelectric ring sensor is used to convert to PI D control within a small deviation range. The conversion of the two is implemented by the DSP according to a preset deviation threshold. And self-correction of fuzzy control rules (automatic search).

The structure and principle of the piezoelectric ring resonator ultrasonic motor are relatively simple and easy to understand, and it is currently the most widely used ultrasonic.

One of wave motors. This paper mainly studies the speed control characteristics and position control characteristics of a circular bimorph piezoelectric sensor with a diameter of 60mm. A circular wave ultrasonic motor has a core part consisting of a stator composed of a piezoelectric ceramic and an elastomer, and a rotor is having a contact surface adhered with a friction material. Among them, there is a chisel on the stator, the rotor and the stator surface is covered with a layer of special friction material, the back of the stator is bonded with the piezoelectric ceramic pzt chip , and rely on the axial pressure generated by the deformation of the rotor pressed together. The most characteristic of the structure of the circular traveling wave ultrasonic motor is that the stator and the rotor are both thin cymbals, making the entire motor structure oblate and circular, which is greatly reducing the size of the motor.